Analysis of the causes of heat exchanger explosions

1. Self-made heat exchangers blindly make major changes to the heat exchanger structure and materials. The manufacturing quality is poor, does not meet the pressure vessel specifications, and the equipment strength is greatly reduced.
2. The welding quality of the heat exchanger is poor, especially the welding joints are not penetrated, and the welds are not inspected and blasted. This leads to leakage or fatigue fracture of the welding joints, and then a large amount of flammable and explosive fluids overflow and explode.
3. Due to corrosion (including stress corrosion and intergranular corrosion), the compressive strength decreases, causing the tube bundle to fail or cause serious leakage, and may explode when exposed to an open flame.
4. When performing an air tightness test on a heat exchanger, using oxygen to compensate for pressure or using flammable refining gas to test for leaks may cause physical and chemical explosions.
5. The heat exchanger is operated in violation of regulations or errors, and the valve is closed, causing an overpressure explosion.
6. If sewage is not discharged for a long time, flammable and explosive substances (such as nitrogen trichloride) accumulate too much, and the operating temperature is too high, causing the heat exchanger (such as the liquid chlorine heat exchanger) to explode violently.
7. Peroxide explosion.